Decoration of Carbon Nanotubes with CoO and Co Nanoparticles

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dc.contributor.authorBelesi, M.en
dc.contributor.authorPanagiotopoulos, I.en
dc.contributor.authorPal, S.en
dc.contributor.authorHariharan, S.en
dc.contributor.authorTsitrouli, D.en
dc.contributor.authorPapavassiliou, G.en
dc.contributor.authorNiarchos, D.en
dc.contributor.authorBoukos, N.en
dc.contributor.authorFardis, M.en
dc.contributor.authorTzitzios, V.en
dc.date.accessioned2015-11-24T17:33:04Z
dc.date.available2015-11-24T17:33:04Z
dc.identifier.issn1687-4110-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/13813
dc.rightsDefault Licence-
dc.subjectanomalous magnetic-propertiesen
dc.subjectferromagnetic metalsen
dc.subjectnuclear resonanceen
dc.subjectcobalten
dc.subjectrelaxationen
dc.subjectlayersen
dc.subjectnickelen
dc.subjectrouteen
dc.subjectco-59en
dc.subjecttubesen
dc.titleDecoration of Carbon Nanotubes with CoO and Co Nanoparticlesen
heal.abstractMultiwall carbon nanotubes (MWNTs) decorated with CoO nanocrystals were synthesized by in-situ thermal decomposition of Co(acac)(2) in oleyl amine under reflux conditions open in the air. The CoO/MWNTs composite material can be easily converted to metallic Co/MWNTs through annealing under reducing atmosphere (4% H(2)) at 500 degrees C without any significant sintering effect. The composite materials characterized by X-ray diffraction, transmission electron microscopy, and Nuclear Magnetic Resonance (NMR) spectroscopy. The structural and morphological characterization shows that the CoO has cubic face (fcc) and the particles deposited uniformly on the external surface of the carbon nanotubes. In the annealed materials, the NMR shows that the fcc and hcp metallic Co phases coexist with a significant percentage of stacking faults. The magnetic measurements indicated that the CoO/MWNTs composite is largely composed of CoO nanoparticles with uncompensated surface spins. The fluctuations of spins persist in partially reduced CoO grains as shown by nuclear spin-lattice relaxation measurements.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDoi 10.1155/2011/320516-
heal.identifier.secondary<Go to ISI>://000298341900001-
heal.journalNameJournal of Nanomaterialsen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2011-
heal.publisherHindawi Publishingen
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικώνel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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